Pulley structure



June 3, 1930. J

G. F. WOMRATH I PULLEY STRUCTURE Filed Jan. 11,- 1928 Mm M. Nm wwm. 7% 5 WWW v W Patented June 3, 19 30 v UNITED s m r is GEORGE IELWOMRATHQ or mmunnrom$mmnnsomn QJHJLLEY STRUCTURE I Application atinee ,11', 1923' Serial No. 245,941. x

This invention relates to pulley structure,' I p the pulley bracket orlfrom eitherendthereof.

capable of wide general application.

Commercial forms of pulleys marketed at i V 'theinvention will be apparentfrom the following'description made in connection with 50 p a this timeare for the most part cumbrous for 5 attachment, andilimited in application' In most of such devices the cord, cable or other flexible member passingover the pulley wheel can only'operate in one direction; and the bracket of thepulley'can only be mounted in one'position relative to its supporting surface Furthermoramost commercial pulleys f are noisy in operation, unsightlyin appearance, and of such structure that excess ve flexiblemember through the back or frontof' These and other objects: and advantagesof the accompanying. drawings wherein like reference characters refer to s m lar parts throughout the several views; and in which,

Fig. l is a front elevation of a window showing an application of my pulley struc- 55 ture 'in connection with adjustable shade a *1 1'.

n Fig. 2 is a perspective :view ofapreferred Wear is often placedon the flexible member;

It is the main object of myinventionto provide anextremely simple but efiicient' pulleystructure, obviatingthe above enumerated objections, capable of beingattached in ig} 3-is a front elevation of said ment ap plied edgewise to a'supporting sur- V embodiment of the inventionapplied to a fiat supporting surface, illustrating one applica 60 tion'of thecord or fiexible member;

embodi- V a plurality of diEerentmannersand adapted to permit the cord or flexible member to be in- 1 V serted from 'any directionjand constructed to afi'ord an unobstructed passage overthe puladapted for universal application and so con structe'd that the cordor flexible'member will never be subjected to excessive wear'or friction but may extend freely fromf fthelpullg i l although applied and threaded'over v I I tachment, and aflat side/Z oppositely dissaid wheel in various" ways.

"Another object of the invention is to prop e a I corners 7 the purpose ofiwhich willlater be described i Sides 5 andfZ extend perpen- 80 'dicularly to the intermediate edge 6. Q'My bracket is preferably formed by stampingor pressing a flat sheet ofmaterial intothe U- 5 shaped 'form'above described, fbutrnay, of. v V

course,*be cast or otherwise constructed, a's'de- 3 sired. Anratta'chment aperture 8 is provided 1 vide a pulley structure ofitheclass abovedescribed, which will befree fromsharp edges fastened to a small :area of supporting 'surface in 'any desire'd position the pulleybracke b i e l qfappl ipn ed 'le i d I Wi a dyq c u ts, any al ig fin ith r i5 'tachment, provision being made to 'direct tlie this Matinee object to provide a com pact face; f: Y y of Fig.4 arvertical cross section taken on line 4-4 of Fig. 3; and i :Figi5 is a perspectlvevlewof said'embodit ment; with on'eof its parallel side's attached tOQasIlPPOI f g, ace and illustrating "a different application'of the cord or flexibl 7 a mber. j V

Asshown in the drawings; my device com prises a channeled pulley casing-or'bracket of U-shaped cross section'having a relative- :ly wide attachment side-5, a relatively narrowintermediate side 6, also 'adapted'for at posecl to attachment side 5 and having cut out 1 'throughiealch of the outer corners, of t h'e rec- 'tangula'rside 5jof the pulley bracketfadapted ,tqlg lcgomlnodate bolts orwscrewsiand being so positioned thattheiretaining 'mmbers; such 9 as the screws 9 may be readily accessible due to the cut out corners 7 a of the side 7 of the bracket. The intermediate side 6 of my pulley bracket is also provided with a pair of attachment ports 10, one disposed adjacent each end, said ports being accessible for securing the retaining members 9 through the open 7 side of the bracket.

Snugly disposed within the U-shaped bracket I mount my pulley wheel 11, its axis extending normal to sides and 7 and parallel with the intermediate side 6. Pulley wheel 11 preferably has a sharply concaved face and fiat sides, which are disposed substantially flush with the inner surfaces of sides 5 and 7 A pin 12 may extend through the sides 5 and 7 of the bracket having itsends, clinched against the outer surfaces of said sides and pulley wheel 11 is snugly mounted for rotation on said pin. A pair of relatively large apertures .13 are formed in the intermediate side 6of the bracket having their centers tangentially alined with the opposite sides ofpulley wheel 11 and of such dimension that a cord or flexible member F may pass around the pulley in the manner shown in full lines in Fig. 2 or Fig. 5, without striking the edges of side 6 defining said apertures. By properly machining my axle pin 12 and by properly drilling the hole through the pulley wheel, the wheel, although having its sides snugly fitting within the bracket, will turn freely and noiselessly.

In Fig. 1 one application of my pulleys is shown in connection with adjustable shade hangers. Here a pair of my pulley structures are attached with the back sides 6 flush against the narrow horizontal surface at the top of a sash frame. A pair of rollers A are ,horizontallymounted in suitable supports at- "tached to the opposite vertical inner sides of the sash frame. As shown, the shades are adapted to overlap at the inner section of the upper and lower window sashes. The upper shade U has its slat supported at its ends by a pair of'fiexible cords 14; and 15. The longer cord 14 extends vertically to the left and through pulley L passing over'the pulley wheel through the open side of the bracket and outhorizont'ally through one of the ends of thebracket, Cord 14 also passes over the pulleyfwheel of the right hand pulley R. The cord 15 extends vertically passing over the wheel of pulley R and downwardly, being joined at K to the cord 14, cord 14 being of I suflicientlength to extend and be secured to a suitable cleat 16'secured to the facing of the sash frame. 7

[It will be "obvious from the foregoing descriptionthatmy pulley bracket may be atftached toja' supporting surface in a multi plic'ity of different manners. T Either the relatively wide side 5 may be attached by applying screws or bolts 9 through the apertures 1 .B side 51'bLe inQgfiush against the supporting surface, or the narrow side 6 may be disposed flush against the supporting surface and bolts 9 applied, as illustrated in Figs. 3 and 4:. In either of said attachments various angular positions of pulley bracket may, of course, be effected to dispose the axis of pulley wheel 11 in such a manner that the cord or flexible member F may be trained over the pulley without friction and without the possibility of scraping against any portion of the bracket. It will be seen that only a very narrow width of supporting surface is necessary whether the pulley bracket is attached edgewise or sidewise, attachment holes 8 be ing alined and the line connecting said holes extending parallel to the back or intermediate side 6 of the bracket.

Pin 12-is so positioned that ample clearance is provided between the back 6 and the pulley wheel whereby the flexible member F may be conveniently disposed between the pulley wheel and back in the different manners shown in Figs. 2 and 3 in full and dotted lines.

The cord F may further be disposed with one or two leaves thereof passing through the back 6 of the bracket, as shown in Fig. 2.

From the foregoing description it will be seen that I have provided a very simple but extremely eflicient pulley structure capable of manufacture at lOWCOSt and adapted to obviate the objections to pulleys commercially manufactured at this time, while affording many new and improved results over the same.

It'will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of the invention.

WVhat is claimed is 1. Pulley structure comprising a bracket of U-shaped' crosssection. having a pair of parallel sides and'an intermediate side extending substantially perpendicular to said parallel sides, a pulley wheel revolubly mounted between said parallel sides and havsides substantially flush thereagainst, and

means for attaching said bracket to said surface with said intermediate side disposed substantially flush thereagainst.

.' 2; Pulley structure having in combination a bracket comprising a single plate of U-shaped cross section having a pair of flat parallel sides, open ends, and an intermediate 7 relatively narrow side extending perpendicular to'Ysaid parallel sides, a'single pulley wheel revolubly mounted between said parallel sides with its axis perpendicular thereto, said' interm ediate side having .a relatively large opening arranged tangentially with respect to said pulley wheel, said intermediate side also having attachment means whereby the bracket may be secured to a surface with said intermediate side disposed flush thereagainst, and one of said parallel sides'h'aving' attachment means whereby said bracket may be securedto a surface with said last mentioned side disposed flush thereagainst. In testimony whereof I'aflix my signature.

GEORGE F. WOMRATH. 

